If it's you're Maint Required light then yes, the switch in back of your instrument cluster will fix this problem.
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If on the other hand it is actually a Check Engine light then there should be a code being stored in your ECU.

Here's how to read the code...

First you'll need to access the Diagnostic connector behind your glove box.
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Next you'll need a non-digital multimeter to read the codes... Here are the procedures to do that.
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Here are what the different codes mean...
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